Starting from the right gas law equation, PV = nRT, you deserve to derive the following equation that permits to fix for the density of a gas exceptionally conveniently.

You are watching: What is the density of o2 at stp

d = MMP/ RT

wbelow MM is the molar mass of the gas, P is the pressure, R is the gas consistent, and also T is the Kelvin temperature.

1) At STP

MM of O2 = 32 g/mol

P = 1 atm

R = 0.0821 L atm / mol K

T = 0 oC + 273 = 273 K

d = (32 x 1) / (0.0821 x 273) = 1.43 g/L

2) P = 760 mm Hg = 1 atm

R = 0.0821 L atm / mol K

T = 25 oC + 273 = 298 K

d = (32 x 1) / (0.0821 x 298) = 1.31 g/L


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